Flux penetration into an artificially granular high-Tc superconductor

M. R. Koblischka; L. Půst; A. Galkin; P. Nálevka; M. Jirsa; T. H. Johansen; H. Bratsberg; B. Nilsson; T. Claeson

doi:10.1103/PhysRevB.59.12114

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Flux penetration into an artificially granular high-Tc superconductor

M. R. Koblischka, L. Půst, A. Galkin, P. Nálevka, M. Jirsa, T. H. Johansen, H. Bratsberg, B. Nilsson, T. Claeson

DOI 10.1103/PhysRevB.59.12114 · Physical Review B

T1

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Abstract

A YBa2Cu3O7−δ thin film is patterned into a hexagonal close-packed lattice of disks (2r=50 μm) which are touching each other at the circumferences in order to enable the flow of an intergranular current. Such a sample was suggested by Koblischka et al. [Appl. Phys. Lett. 70, 514 (1997)] as a model for a layered granular structure like in a (Pb,Bi)2Sr2Ca2Cu3O10+δ (Bi-2223) tape. The magnetization measurements reveal an anomalous position of the low-field peak (central peak) similar to Bi-2223 tapes. Magneto-optic imaging is employed to visualize the local-field distributions. At low magnification, the flux patterns in the intergranular area between the disks are observed. The observations at high magnification reveal the flux penetration and pinning within the disks. It is shown that such samples may serve as model samples for granular high-Tc superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure not reported	unknown
(Pb,Bi)2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(Pb,Bi)2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown